A centuries-old forgotten underworld lies beneath Malta.

These lesser-known Maltese catacombs date back over 1,700 years.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This subterranean necropolis holds three floors of antler-dug grave caves.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

Once known throughout Europe, this tiny and unusually progressive 18th century micro-nation within Lithuania now lies in ruins.

The oldest funicular in Lithuania has been climbing this steep hill since 1931.

A narrow strip of land is home to the tallest migrating dunes in Europe.

A curious art park at the geographic center of Europe is home to 3,000 television sets and other wonders.

Things aren't quite what they seem at this mind-bending museum.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

How this choice of tombstone came to be is still a mystery.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

These abandoned vessels are destined to be reclaimed by the forest.

Guests become prisoners on a visit to Latvian prison.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Spend the night in 1920s Latvia in this historic recreation and movie set.

3,000 market stands in five former Zeppelin hangars.